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ERROR: No texture in the texture slot.

I am converting my sketchfab models into blend4web format.I used textures anywhere because otherwise sketchfab rendered different with Chrome and Firefox.Looks like blend4web does not render different so I decided to delete textures, where ther is just plain color.Now I get this error with one material and it renders purple as missing texture.ERROR: No texture in the texture slot. Material "red arrow".

It happens when you delete the texture with shift, leaving it 0 users. So after reopening the file the texture will be missing, but the slot won't be deleted, it will just be empty. And Blender will do something like this